Cheetah, a chimp who is believed to have played Tarzan's sidekick in the 1930s movies, died on Christmas Eve at the age of 80. In response to his death, Mia Farrow, daughter of actress Maureen O'Sullivan, tweeted, "My mom, Tarzan's Jane, referred to Cheetah-the-chimp as 'that bastard' –- saying he bit her at every opportunity." In the clip above he looks affectionate — but we bet a bite was just around the corner.